Lets say I have a good content optimized and everything like keywords density, proximity and stuff all to make make it as SEO friendly as possible in other words it's perfect except that it has some grammar errors with this have a negative effect?

The only effect I can think of is if you spell words wrong then Google will have hard time finding good keywords. Lets say you are trying to rank high for "Internet Marketing" if you spell it wrong then the content might be associated with some bogus keywords that have no search volume at all.

Agree with invisible dude. If you can't spell a KW, it won't be ranked properly!

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Let's Forum is an internet discussion community that helps folks (webmasters) involved in the internet marketing, SEO (search engine optimization) and website development or design. Learn how to increase your business (eCommerce) website rankings, how to get on Google first page if you are a webmaster, new marketing techniques and ideas that will give you the necessary boost to achieve your goals.